HDDS-7510. Recon: Return number of open containers in /clusterState endpoint

hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/api/ClusterStateEndpoint.java

@@ -19,6 +19,7 @@
 package org.apache.hadoop.ozone.recon.api;
 
 import org.apache.hadoop.hdds.protocol.DatanodeDetails;
+import org.apache.hadoop.hdds.protocol.proto.HddsProtos;
 import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeStat;
 import org.apache.hadoop.hdds.scm.node.NodeStatus;
 import org.apache.hadoop.hdds.scm.server.OzoneStorageContainerManager;
@@ -97,6 +98,8 @@ public Response getClusterState() {
     int totalMissingContainerCount = unhealthyContainers.size() ==
         MISSING_CONTAINER_COUNT_LIMIT ?
         MISSING_CONTAINER_COUNT_LIMIT : unhealthyContainers.size();
+    int openContainersCount = this.containerManager.getContainerStateCount(
+        HddsProtos.LifeCycleState.OPEN);
     int healthyDatanodes =
         nodeManager.getNodeCount(NodeStatus.inServiceHealthy()) +
             nodeManager.getNodeCount(NodeStatus.inServiceHealthyReadOnly());
@@ -139,6 +142,7 @@ public Response getClusterState() {
         .setMissingContainers(totalMissingContainerCount)
         .setTotalDatanodes(datanodeDetails.size())
         .setHealthyDatanodes(healthyDatanodes)
+        .setOpenContainers(openContainersCount)
         .build();
     return Response.ok(response).build();
   }

hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/api/types/ClusterStateResponse.java

@@ -60,6 +60,12 @@ public final class ClusterStateResponse {
   @JsonProperty("missingContainers")
   private int missingContainers;
 
+  /**
+   * Total count of open containers in the cluster.
+   */
+  @JsonProperty("openContainers")
+  private int openContainers;
+
   /**
    * Total count of volumes in the cluster.
    */
@@ -97,6 +103,7 @@ private ClusterStateResponse(Builder b) {
     this.storageReport = b.storageReport;
     this.containers = b.containers;
     this.missingContainers = b.missingContainers;
+    this.openContainers = b.openContainers;
   }
 
   /**
@@ -110,6 +117,7 @@ public static final class Builder {
     private DatanodeStorageReport storageReport;
     private int containers;
     private int missingContainers;
+    private int openContainers;
     private long volumes;
     private long buckets;
     private long keys;
@@ -118,6 +126,7 @@ public Builder() {
       // Default values
       this.containers = 0;
       this.missingContainers = 0;
+      this.openContainers = 0;
       this.volumes = 0;
       this.buckets = 0;
       this.keys = 0;
@@ -156,6 +165,11 @@ public Builder setMissingContainers(int missingContainers) {
       return this;
     }
 
+    public Builder setOpenContainers(int openContainers) {
+      this.openContainers = openContainers;
+      return this;
+    }
+
     public Builder setVolumes(long volumes) {
       this.volumes = volumes;
       return this;
@@ -206,6 +220,10 @@ public int getMissingContainers() {
     return missingContainers;
   }
 
+  public int getOpenContainers() {
+    return openContainers;
+  }
+
   public long getBuckets() {
     return buckets;
   }